Filter.



HOWARD PHILIP STRAHL, OF CLEVELAND, OHIO.

FILTER.

Specification of Letters .Patent Application led February 19, 1909.Serial No. 478,770.

To all rwhom it may concern:

Be it known' that I, HOWARD P. STRAHL, a citizen of the United States,and a resident ,lof Cleveland, in the county of Cuyahoga and State ofOhio,'have invented a new and` Improved Filter, of which the followingis a full,clear, and exact description.

This invention relates to filters especially useful in filtering air,and relates more particularly to a filter comprising a casing, aperforated tube within. the casing, spaced caps at the ends of theperforated tube, and

filter material surrounding the tube betweenA the caps, the caps havingflanges which prod Y, ject over the material to hold it in place.

. An object of the invention is to provide a simple, inexpensive anddurable filter for filtering air or other fluids, with which filtermaterial of di'erent kinds can be em loyed, in which the filter materialis securely held in place by adjustable caps, and in which the 'casing sahead forming a lock nut for one of the caps. A

A further object of the invention Lis to provide a device of the classdescribed, which can be employed for various purposes filtering air,which can be easily taken apart to permit of its cleansing, and 1 nwhich surgical linen or like fabrics, and wire gauze or net are employedas filter material.

The invention consists in the construction and combination of parts tobe more. fully described hereinafter .and particularly set forth in theclaims.

Reference is to be had to the .ac-companyn Y. I fication,\1n W chsimilar characters of reference indica e corresponding parts in ,all

the views, and in which- Figure 1 is a longitudinal section of anembodiment fof my invention;'Fig. 2 is a' side elevation of theperforated tube and the filter material held in lace thereon by means ofthecaps, part of the material being broken away; and Fig. 3 is anenlarged transverse section on the line 3-3 of Fig. 1.

Before proceedingto a morel detailed explanation of my invention itshould be clearly understood 'that while Athe same is particularlyuseful for filtering air, it can also be advanta eously ein loyed infiltering other fluids suc as liqui s. I have vfoun that in certainsurgical work it is necessary to spraysolutions into woundsand the like,and that for this purpose the air used iii ing drawings forming a partof this specispraying must be as nearly-pure as possible. My filter iswell ada ted to remove impurities from air when 1t is placed between asource of compressed air and aA spraying apparatus. It can also beadvantageously employed in connection with pneumatic tools. Under thelast-mentioned circumstances it removesy from the air the moisture,which tends to rust the tools.

Referring moreparticularly to the draw- Patented Jan. 4, 1910.

ings, I provide lan outer filter casing or barrel 10, having one endclosed by an integral head 11, which is provided with an extension l2,having a threaded opening therethrough vand forming an inlet for thecasing. The inlet can Abe connected in any suitable way with the airsupply, for example, by means of a controlling cock 13 of the usual-form and a flexible tube 14. At the end remote from the inlet, thecasing islthreaded at the outside andreceives'a correspondingly threadedremovable casing head 15 which has an extension 16 provided with athreaded opening therethrough. I

A perforated tube 17 is arranged within the casing and has openings18-to permit the escape of air therethrough. The tube 17 has one end 19threaded and arranged within the threaded opening of the casing head 15.It

projects from the casing head to receive remvably, a flexible tube 20 orother conduit for connecting it with the point at which the air is to beemployed. The free inner end 21 of the tube 17 is threaded and carries acap 22, having a correspondingly threaded opening therethrough andprovided with a laterally extending flange 23, at the rim. A similar,oppositely disposedcap 24, having an annular flange 25, is mounted atthe other end of the tube 17 u on the threadedpart 19 within the casing.Lil`he caps are adJustable owing to their threaded engagement with thetube 17, and the'casing head 15 forms a lock nut for thel cap 24, as itcan be screwed` vagainst the same.

The head 15 also serves'to position within the -applied around-the tube17, and the flan es 23 and 25 extend over the material at .t 1e ends,tohold it in place as is shown most clearly inFig. 1. I prefer to employas filter material, surgical linen or like and wire gauze 29, consistingpreferably of ne mesh copper or brass net. and the net are superposedand then Wound The fabric together upon the tube 17, thus forming aboutthe same alternate layers of fabric extending longitudinally of saidtube over and net. A strip 26 of suitable material can be secured to thetube and to,the filter material, to hold the end of the latter in placewhen the winding of the same about the tube is begun. At the outside ofthe filter material are positioned several layers or windings of aheavier fabric 27, which serves as a protection for the other filtermaterial and also retains the major part of the impurities. The airentersy through the inlet l2 and passes through the filter lmaterialinto the tube 17, escaping through the casing head 15 which communicatesinteriorly with the conduit 20. The threadsat the free end 2l of thetube 17 are preferably oppositely disposed from the threads of the end19. Thus, if the threads of thel latter are right-'hand threads, thoseat the end 21 will be left-hand.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent:

l. A filter, comprising a casing, a perforated tube therein, spaced capsremovably mounted upon said tube, and filter material between said tubeand said casing, said caps having members extending longitudinally ofthe tube. over said material t0 hold the same in place.

2. A filter, comprising a casing having a removable casing head, aperforated tube in said casing and carried bysaid head, caps on saidtube, and filter material on said tube between said caps, said capshaving -flanges said material to hold the same in place, said casinghaving. an inlet, said tube being adapted to communicate with an airconduit.

3. A filter, comprising a casing having at one end an inlet and at `theother end a removable casing head, a perforated tube carried by saidcasing head and extending intoA said casing, caps mounted upon said tubeand having laterally extending flanges, said v casing head acting aslocking means for one of said caps, and filter material wound about saidperforated tube between said caps and under said flanges, said tubebeing adapted to communicate 'with an air conduit.

4. A filter, comprising a casing having a removable casing head, aperforated tube within said casing, caps mounted upon said tube, one ofsaid caps being adjustable longitudinal of said tube, andfilter materialbetween said caps upon said tube, said caps eX- tending over saidmaterial to hold the same in place. c l l 5. A filter, comprising acasing having a screw casing head at one end, said casing head having athreaded opening therethrough, a perforated tube having a threadedportion mounted in said opening of said head, a cap mounted upon saidthreaded portion and having a lateral flange, a second cap upon said tue and having a lateral flange, said first cap being adjustablelongitudinally of said tube, said casing head acting as a lock nut forsaid first cap, and filter material wound upon said tube between saidcaps and under the flanges thereof.

6. In a filter, a perforated member having alternate superposed layersof gauze and fibrous materia-l wound thereon.

7. In a filter, a perforated member having wound thereon superposedlayers of fibrous material and metal gauze, and av fabric encompassingsaid layers.

8. A filter, comprising a casing, a perforated tube in the casing andhaving itsends screw threaded, one end of the tube being closed and theother end projecting through one end of the casing and adapted to beconnected with ay conduit, filtering material on the tube, and meanswithin the casing and screwing on the tube for holding the filteringmedium in place on said tube.

9. A filter, comprising a casing having a removable head at one. end, aperforated tube inthe casing and having screw threaded ends, one ofwhich is closed. the head of the casing screwing upon open end of thetube with said end projecting beyond said head and adapted to beconnected with a conduit, filtering material on the tube, and meanswithin the casing and screwing on the tube for holding the filteringmaterial in place on the said tube.

10. A filter, comprising a casing having one end open and externallyscrew threaded, a perforated tube in the casing and having screwthreaded ends, one of which is closed, filtering material on thetube,'means within the tube and screwing on the threaded ends of thetube to hold the filtering lmaterial in place on said tube, and a headfor the casing, said' liead screwingronthe casing and the open end -ofthe tube.

11. A filter, comprising a. casing having an inlet at one end, aperforated tube having one end closed and arranged in the casing withits closed end adjacent to the inlet end of the casing and its onen endprojecting from the opposite end of said casing, and a filteringmaterial on the said tube.

In testimony whereof I have signed my namefto this specification-in thepresence of two subscribing witnesses.

HOWARD PHILIP sTRAHn Witnesses:v v S. G. OsMRoD, y

S. B. ROBINSON.

